Effects of intramolecular basis set superposition error on conformational energy difference of 1,2-difluoroethane and 1,2-dimethoxyethane

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The conformation dependences of basis set superposition errors (BSSE) for 1,2-difluoroethane (DFE) and 1,2-dimethoxyethane (DME) molecules have been estimated using counterpoise method at the Moller-Plesset second order perturbation (MP2) level of theory with various basis sets, assuming that all BSSE dependences on conformations are due to the change in CC bond. The BSSE on the energy differences between eclipsed and gauche forms of DFE are in the range of 0.2-1.2 kcal/mol and those between local minima, gauche and anti forms, are less than 0.2 kcal/mol. For the larger DME molecule, the BSSE differences between local minima are still less than 0.4 kcal/mol, but may not be ignored compared to the energy differences of 0.2-3.0 kcal/mol between conformers.
Publisher
KOREAN CHEMICAL SOC
Issue Date
2002
Language
English
Article Type
Article
Keywords

POSSIBLE DEFINITION; AB-INITIO; RELAXATION

Citation

BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.23, no.9, pp.1267 - 1271

ISSN
0253-2964
URI
http://hdl.handle.net/10203/79442
Appears in Collection
CH-Journal Papers(저널논문)
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